Method of providing 911 service to a private branch exchange

Abstract

A method of providing 911 service to a private branch exchange, includes grouping a plurality of private telephone numbers into a set. An outgoing telephone line for a 911 call is assigned to the set. A location information for the outgoing telephone line is input into a location database.

1. A method providing 911 service to a private branch exchange, comprising the steps of:
 a) determining if a 911 call has been placed at the private branch exchange,  
 b) when the 911 call has been placed, determining a telephone line originating the 911 call; and  
 c) selecting a predetermined outgoing telephone line associated with the originating telephone line.  
 
     
     
       2. The method of  claim 1 , further including the steps of:
 d) placing the 911 over the outgoing telephone line  
 e) routing the 911 call to a public safety answering point.  
 
     
     
       3. The method of  claim 2 , further including the step of:
 f) sending a location query to a location database.  
 
     
     
       4. The method of  claim 1 , wherein step (a) further includes the steps of:
 a1) selecting an internal telephone line;  
 a2) determining a location of a telephone associated with the internal telephone line;  
 a3) assigning an outgoing telephone line to the internal telephone line for a 911 call.  
 
     
     
       5. The method of  claim 4 , further including the step of:
 a4) repeating steps (a1) through (a3) for each internal telephone line.  
 
     
     
       6. The method of  claim 4 , further including the step of:
 a4) entering a location information associated with the outgoing telephone line in a location database.  
 
     
     
       7. A method providing 911 service to a private branch exchange, comprising the steps of:
 a) entering a location information for an outgoing line from the private branch exchange;  
 b) determining a location of a telephone associated with each internal line of the private branch exchange; and  
 c) when the location of the telephone associate with the internal line corresponds with the location information, programming the private branch exchange to route a 911 call from the telephone over the outgoing telephone line.  
 
     
     
       8. The method of  claim 7 , wherein step (a) further includes the step of:
 a1) repeating step (a) for each outgoing line from the private branch exchange.  
 
     
     
       9. A method providing 911 service to a private branch exchange, comprising the steps of:
 a) grouping a plurality of internal telephones coupled to a private branch exchange into a plurality of groups;  
 b) assigning a separate public telephone line coupled to the private branch exchange to each of the plurality of groups; and  
 c) entering a location information in a location database of a public safety answer point for each of the separate public telephone lines associate with one of the plurality of groups.  
 
     
     
       10. The method of  claim 9 , further including the step of:
 d) programming the private branch exchange to route a 911 call from any internal telephone in one of the plurality of groups over the assigned separate public telephone line.  
 
     
     
       11. The method of  claim 9 , further including the step of:
 d) receiving a 911 call at the private branch exchange;  
 e) determining a group associated with an internal telephone line placing the 911 call;  
 f) selecting an assigned public telephone line to place the 911 call.